diff --git a/jerry-core/lit/lit-globals.h b/jerry-core/lit/lit-globals.h
index 7f6978694..1aff7084d 100644
--- a/jerry-core/lit/lit-globals.h
+++ b/jerry-core/lit/lit-globals.h
@@ -114,6 +114,11 @@ typedef uint8_t lit_utf8_byte_t;
  */
 typedef uint32_t lit_utf8_size_t;
 
+/**
+ * Size of a magic string in bytes
+ */
+typedef uint8_t lit_magic_size_t;
+
 /**
  * Unicode code point
  */
diff --git a/jerry-core/lit/lit-magic-strings.cpp b/jerry-core/lit/lit-magic-strings.cpp
index 79db9f4d9..ebde06654 100644
--- a/jerry-core/lit/lit-magic-strings.cpp
+++ b/jerry-core/lit/lit-magic-strings.cpp
@@ -20,7 +20,7 @@
 /**
  * Lengths of magic strings
  */
-static lit_utf8_size_t lit_magic_string_sizes[LIT_MAGIC_STRING__COUNT];
+static lit_magic_size_t lit_magic_string_sizes[LIT_MAGIC_STRING__COUNT];
 
 /**
  * External magic strings data array, count and lengths
@@ -52,7 +52,7 @@ lit_magic_strings_init (void)
        id < LIT_MAGIC_STRING__COUNT;
        id = (lit_magic_string_id_t) (id + 1))
   {
-    lit_magic_string_sizes[id] = lit_zt_utf8_string_size (lit_get_magic_string_utf8 (id));
+    lit_magic_string_sizes[id] = (lit_magic_size_t) lit_zt_utf8_string_size (lit_get_magic_string_utf8 (id));
 
 #ifndef JERRY_NDEBUG
     ecma_magic_string_max_length = JERRY_MAX (ecma_magic_string_max_length, lit_magic_string_sizes[id]);